YASKAWA E-S Series Product Manual

Contents

5.4 Settings That Must Be Adjusted to the System5.4.5 Motor Overload Detection Level5-28Linear CoordinatesFor a ball screw or other equipment with linear coordinates, set PnB20 to 0, set the forwardsoftware limit (P-LS) in PnB21, and set the reverse software limit (N-LS) in PnB23.An error will occur if the positioning target point exceeds a software limit.An error will also occur if ±INFINITE is specified for the target position in the program table.If the motor reaches a software limit during jog speed table operation, the motor will bestopped at the deceleration rate set in PnB2B.If you set both PnB21 and PnB23 to 0, the software limits are disabled.The software limits are enabled when homing is completed. However, if PnB31 is set to 0(operate without homing), the software limits are enabled as soon as the power supply isturned ON.Rotational CoordinatesFor a rotary table or other equipment with rotational coordinates, set PnB20 to 1 (shortestpath), 2 (always forward), or 3 (always reverse). Set the last rotational coordinate in PnB21 andthe first rotational coordinate in PnB23.The software limits are disabled.If PnB20 is set to 1 (shortest path) and an absolute position is specified for the positioningposition, either forward or reverse rotation will be used, whichever is shorter.If PnB20 is set to 2 (always forward) and an absolute position is specified for the positioningposition, forward rotation will always be used.If PnB20 is set to 3 (always reverse) and an absolute position is specified for the positioningposition, reverse rotation will always be used.If a relative position is specified, rotation will be in the specified direction regardless of the set-ting of the parameter.If a rotary table or other device with rotational coordinates is used, but mutiturn operation is notpossible, use linear coordinates (PnB20 = 0).In this case, PnB21 and PnB23 are for software limits.5.4.5 Motor Overload Detection LevelThe motor overload detection level is the threshold used to detect overload alarms and over-load warnings when the Servomotor is subjected to a continuous load that exceeds the Servo-motor ratings.It is designed to prevent Servomotor overheating.You can change the detection timing for A.910 warnings (Overload) and A.720 alarms (Contin-uous Overload). You cannot change the detection level for A.710 alarms (Instantaneous Over-load).Forward software limit(P-LS): PnB21Reverse software limit(N-LS): PnB23WorkpieceExample • PnB21 = +3,599 and PnB23 = 0 • PnB21 = +4,999 and PnB23 = -5,000PnB23 = 0PnB21 = +3599 PnB23 = -5000PnB21 = +4999Starting point Starting point